QCD radiative correction to color-octet $J/\psi$ inclusive production at B Factories - INSPIRE

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QCD radiative correction to color-octet $J/\psi$ inclusive production at B Factories

Yu-Jie Zhang
(
- Peking U.
)
,
Yan-Qing Ma
(
- Peking U.
)
,
Kai Wang
(
- Peking U.
)
,
Kuang-Ta Chao
(
- Peking U. and
- Unlisted, CN
)

Nov, 2009

18 pages

Published in:

Phys.Rev.D 81 (2010) 034015

e-Print:

0911.2166 [hep-ph]

DOI:

10.1103/PhysRevD.81.034015

View in:

ADS Abstract Service

reference search106 citations

Citations per year

Abstract: (arXiv)

In nonrelativistic Quantum Chromodynamics (NRQCD), we study the next-to-leading order (NLO) QCD radiative correction to the color-octet

J/\psi

inclusive production at B Factories. Compared with the leading-order (LO) result, the NLO QCD corrections are found to enhance the short-distance coefficients in the color-octet

J/\psi

production

e^+ e^-\to c \bar c (^3P_0^{(8)} {\rm or} ^3P_0^{(8)})g

by a factor of about 1.9. Moreover, the peak at the endpoint in the

J/\psi

energy distribution predicted at LO can be smeared by the NLO corrections, but the major color-octet contribution still comes from the large energy region of

J/\psi

. By fitting the latest data of

\sigma(e^{+}e^{-}\to J/\psi+X_{\mathrm{non-c\bar{c}}})

observed by Belle, we find that the values of color-octet matrix elements are much smaller than expected earlier by using the naive velocity scaling rules or extracted from fitting experimental data with LO calculations. As the most stringent constraint by setting the color-singlet contribution to be zero in

e^{+}e^{-}\to J/\psi+X_{\mathrm{non-c\bar{c}}}

, we get an upper limit of the color-octet matrix element,

<0| {\cal O}^{J/\psi}[{}^1S_0^{(8)}]|0> + 4.0 <0| {\cal O}^{J/\psi} [{}^3P_0^{(8)}]|0>/m_c^2 <(2.0 \pm 0.6)\times 10^{-2} {\rm GeV}^3

at NLO in

\alpha_s

.

13.66.Bc
12.38.Bx
electron positron: inclusive reaction
electron positron: annihilation
channel cross section
quantum chromodynamics: radiative correction
higher-order: 0
quantum chromodynamics: nonrelativistic
velocity: scaling
higher-order: 1

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